On 9/17/13 4:43 PM, Daniel Colascione wrote: >>> +(defun byte-optimize-do-constant-propagation (let-form) By the way: why do we have byte-optimize forms _and_ compiler macros? I understand that compiler macros come from cl and the byte-optimize stuff is much older, but why separate them these days? byte-optimize forms look and work like compiler macros, so why aren't they compiler macros?